IMECH-IR  > 流固耦合系统力学重点实验室
Accuracy of the moment-tensor inversion of far-field P waves
Kong Y1; Li M1; Chen WM(陈伟民)2,4; Kang BQ3
Corresponding AuthorChen, Weimin(wmchen@imech.ac.cn)
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
2020
Volume220Issue:1Pages:248-256
ISSN0956-540X
AbstractThe far-field assumption is widely used and suitable for the moment-tensor inversion in which the source-receiver distance is quite long. However, the description of far field is uncertain and an explicit far-field range is missing. In this study, the explicit far-field range is determined and the errors of moment-tensor solutions produced by the far-field approximation are analysed. The distance, for which the far-field assumption is satisfied and the effect of the near-field term can be ignored, is directionally dependent. For the shear dislocation, in the directions near the nodal lines of the far-field P waves, the far-field distance is heavily dependent on the displacement component used to invert moment tensors. The radial component of displacement, which is parallel to the wave propagation direction, is recommended for the inversion and the corresponding far-field distance is quite short. In the directions far from the nodal lines, the selection of displacement components has little influence on the far-field distance. The maximum far-field distance appears in the directions of the pressure and tensile axes of the source and the value is about 30 wavelengths of radiated waves. Using more receivers (>6) in the moment-tensor inversion can shorten the far-field distance. The effect of the near-field term on the moment-tensor inversion for tensile dislocations and isotropic sources (explosion or implosion) can be ignored. The conclusions obtained in this study are helpful for determining the positions of receivers and evaluating the accuracy of moment-tensor solutions, with far-field assumption being applied in the inversion.
KeywordInverse theory Bodywaves Earthquake source observations Wave propagation
DOI10.1093/gji/ggz446
Indexed BySCI ; EI
Language英语
WOS IDWOS:000506839900016
WOS KeywordEARTHQUAKE SOURCE PARAMETERS ; DOUBLE-COUPLE MECHANISMS ; PERIOD SURFACE-WAVES ; NEAR-FIELD ; RAPID-DETERMINATION ; FOCAL MECHANISMS ; DEFORMATION ; CRACKS
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Funding ProjectStrategic Priority Research Program of the Chinese Academy of Sciences[XDA22000000]
Funding OrganizationStrategic Priority Research Program of the Chinese Academy of Sciences
Classification二类
Ranking1
ContributorChen, Weimin
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/81311
Collection流固耦合系统力学重点实验室
Affiliation1.Beihang Univ, Sch Aeronaut Sci & Engn, Beijing 100083, Peoples R China;
2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China;
3.Chinese Acad Sci, Technol & Engn Ctr Space Utilizat, Key Lab Space Utilizat, Beijing 100094, Peoples R China;
4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Kong Y,Li M,Chen WM,et al. Accuracy of the moment-tensor inversion of far-field P waves[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2020,220(1):248-256.
APA Kong Y,Li M,陈伟民,&Kang BQ.(2020).Accuracy of the moment-tensor inversion of far-field P waves.GEOPHYSICAL JOURNAL INTERNATIONAL,220(1),248-256.
MLA Kong Y,et al."Accuracy of the moment-tensor inversion of far-field P waves".GEOPHYSICAL JOURNAL INTERNATIONAL 220.1(2020):248-256.
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